Self-closing ventilation louver



FIG. 1 is a front elevational view of a self-closing ventilation louver showing my new design;

FIG. 2 is a top plan view thereof, the bottom being the same as the top shown;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is an elevational view taken from one side thereof, the opposite side being the same as the side shown. 

The ornamental design for a self-closing ventilation louver, as shown and described. 